Cisco 1841 T1 PPP config

We replaced an Adtran channel bank with a Cisco 1841 with T1 Wic. The T1 provider has assigned an IP for the T1 serial interface that is a 1-to-1 IP they list as WAN 74.xxx.xxx.xxx 255.255.255.252. They also list a Public Lan subnet of 216.xxx.xxx.xxx 255.255.255.240. I am trying to configure the router so that DNS mail entries pointed to a 216.xxx.xxx.xxx address will be NAT'd to a 192.168.1.10 address connected to the FE0/0 interface. Is there a way to create a virtual interface between the serial and FE interfaces that can be configured to repond to requests sent to the 216 IP? I also need outgoing traffic to be tagged as from the 216 address for reverse PTR reasons. Below is the current config:

You just need to do it with NAT
Take off your secondary IP and the ACL(since it does nothing from the fe0/0 interface like thisinterface FastEthernet0/0
description LAN$ETH-LAN$
ip address 192.168.1.254 255.255.255.0
ip nat inside
Then change your NAT to look like this:

Thank you for the input on the NAT/ PAT configuration.
I'm a little confused when it comes to the ACL. Maybe its because all of the prior pieces I've configured had the security IOS but I thought if you didn't include the ACL it wouldn't allow any outbound traffic?